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Gypsum plaster (plaster of Paris) Gypsum plaster, also known as plaster of Paris, is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite. Etymology. The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
Mar 14, 2024 · plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
- The Editors of Encyclopaedia Britannica
One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry. All forms are white solids that are poorly soluble in water. [5] . Calcium sulfate causes permanent hardness in water. Hydration states and crystallographic structures.
- CaSO₄
- 136.14 g/mol (anhydrous), 145.15 g/mol (hemihydrate), 172.172 g/mol (dihydrate)
- 1,460 °C (2,660 °F; 1,730 K) (anhydrous)
- 0.26 g/100ml at 25 °C (dihydrate)
Feb 18, 2024 · Key Takeaways: Plaster of Paris is a gypsum-based casting material used for sculpting and creating orthopedic casts. Its ability to harden quickly when mixed with water makes it ideal for various art and craft projects. Plaster of Paris has a long history of use in construction, art, and medicine.
An enormous plaster mockup of the elephant stood in the square for many years after the emperor's final defeat and exile. In 1811, Napoleon decreed the building of an immense palace on the Chaillot Hill across the river from the Champ de Mars. It was intended to eclipse every palace in Europe in size and luxury, but only the foundations had ...
Oct 16, 2013 · The name Plaster of Paris (POP) had its origins from the fact that it was extensively mined from Montmartre in Paris district. But its use predates the industrial revolution, they have been found on the insides of pyramids.
